Hepatitis C antibody
Focused panel or single testShows past or current hepatitis C infection.
Why it matters: USPSTF recommends screening all adults 18–79 at least once.
Ranges: Reported as reactive or nonreactive.
What can affect it: Past exposure.
If it’s out of range: A reactive result gets a confirmation test; hepatitis C is curable.
When to retest: Only with new risk.
Condition guide: Hepatitis B & C testing online
HIV antigen/antibody
Focused panel or single testScreens for HIV infection.
Why it matters: USPSTF recommends screening ages 15–65.
Ranges: Reported as reactive or nonreactive.
What can affect it: Recent exposure can be missed in the first weeks.
If it’s out of range: A reactive result gets confirmation and a referral plan.
When to retest: Only with new risk.
Condition guide: STD testing online
Hepatitis B surface antigen
Focused panel or single testShows current hepatitis B infection.
Why it matters: Part of the triple panel the CDC (2023) recommends for all adults at least once.
Ranges: Reported as reactive or nonreactive.
What can affect it: Infection status.
If it’s out of range: A reactive result gets further testing and care.
When to retest: Only with new risk.
Condition guide: Hepatitis B & C testing online
Hepatitis B surface antibody
Focused panel or single testShows immunity from vaccination or past infection.
Why it matters: Part of the CDC triple panel.
Ranges: Reported as reactive or nonreactive.
What can affect it: Vaccination and past infection.
If it’s out of range: No immunity? Vaccination is offered.
When to retest: Only if advised.
Condition guide: Hepatitis B & C testing online
Hepatitis B core antibody
Focused panel or single testShows past or current infection.
Why it matters: Part of the CDC triple panel.
Ranges: Reported as reactive or nonreactive.
What can affect it: Past infection.
If it’s out of range: Read with the other two results.
When to retest: Only if advised.
Condition guide: Hepatitis B & C testing online